Chemical Engineering Thermodynamics
Which of the following processes can not be made reversible even under ideal condition of operation?

Expansion of steam in a turbine
All of these
Free expansion of a gas
Compression of air in a compressor

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Chemical Engineering Thermodynamics
Law of corresponding states says that

, two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same
The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature
No gas can be liquified above the critical temperature, howsoever high the pressure may be
The molar heat of energy of gas at constant volume should be nearly constant (about 3 calories)

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